IntroductionThe telegraph was the only
long distance instant communication device until radio and other
means came along. A telegraph key was the tool used to send coded
messages, but why are there so many
different models of telegraph
keys? What are the differences? What do they do? Can we just
use any key as a telegraph key? What caused developing so many
different designs?

Material and instructionsThe
purpose of this project is to investigate and make a close observation
of different telegraph keys and build a simple working model of a
telegraph key.

Details of
this project
More information or support for this project is available at
members section of ScienceProject.com. You may also find a Science
kit for this topic at MiniScience.com.